Update golangci-lint in Makefile and tools/go.mod to v1.50.1

[abayer]

Changes

We've changed to using golangci-lint v1.50.1 in CI, and have added new configured linters that aren't available in the older v1.47.2 which we have been using in Makefile and tools/go.mod, so let's update those places accordingly.

I noticed this when I ran make golangci-lint locally and the old version was built/used and I got an error message about missing linters. =)

cc @bendory

/kind cleanup

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[bendory]

Thank you for cleaning this up!

Ref: #5899

[bendory]

/lgtm
even if the robot doesn't like me yet :-(

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[vdemeester]

/lgtm